2006 INFINITI QX56 check engine

MA-14
ENGINE MAINTENANCE
Revision: November 20092006 QX56
3. Open the radiator drain plug at the bottom of the radiator, and
remove the radiator filler cap. This is the only step required
when partially draining the cooling system (radiator only).
CAUTION:
Do not to allow the coolant to contact the drive belts.
4. When draining all of the coolant in the system for engine removal or repair, it is necessary to drain the cylinder block.
Remove the RH cylinder block drain plug to drain the right bank
and the oil cooler hose to drain the left bank as shown.
5. Remove the reservoir tank to drain the engine coolant, then clean the reservoir tank before installing it.
6. Check the drained coolant for contaminants such as rust, corrosion or discoloration. If the coolant is contaminated, flush the engine cooling system. Refer to MA-15, "
FLUSHING COOLING
SYSTEM" .
REFILLING ENGINE COOLANT
1. Close the radiator drain plug. Install the reservoir tank, cylinder block drain plug, and the oil cooler hose, ifremoved for a total system drain or for engine removal or repair.

The radiator must be completely empty of coolant and water.

Apply sealant to the threads of the cylinder block drain plug. Use Genuine High Performance Thread
Sealant or equivalent. Refer to GI-46, "
Recommended Chemical Products and Sealants" .
2. Set the vehicle heater controls to the full HOT and heater ON position. Turn the vehicle ignition ON with the engine OFF as necessary to activate the heater mode.
3. Remove the vented reservoir cap and replace it with a non-vented reservoir cap before filling the cooling system.
WBIA0391E
PBIC0146E
WBIA0392E
Radiator drain plug : Refer to CO-14, "RADIATOR" .
RH cylinder block drain plug : Refer to EM-78, "
CYLINDER BLOCK" .

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Revision: November 2009 2006 QX56
4. Install the Tool by installing the radiator cap adapter onto the
radiator neck opening. Then attach the gauge body assembly
with the refill tube and the venturi assembly to the radiator cap
adapter.
5. Insert the refill hose into the coolant mixture container that is placed at floor level. Make sure the ball valve is in the closed
position.

Use Genuine NISSAN Long Life Anti-freeze coolant or equiv-
alent, mixed 50/50 with distilled water or demineralized water.
Refer to MA-12, "
ANTI-FREEZE COOLANT MIXTURE
RATIO" .
6. Install an air hose to the venturi assembly, the air pressure must be within specification.
CAUTION:
The compressed air supply must be equipped with an air
dryer.
7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is
full of coolant, close the ball valve. This will purge any air trapped in the refill hose.
8. Continue to draw the vacuum until the gauge reaches 28 inches of vacuum. The gauge may not reach 28 inches in high altitude
locations, refer to the vacuum specifications based on the alti-
tude above sea level.
9. When the vacuum gauge has reached the specified amount, disconnect the air hose and wait 20 seconds to see if the system loses any vacuum. If the vacuum level drops, perform any necessary repairs to the
system and repeat steps 6 - 8 to bring the vacuum to the specified amount. Recheck for any leaks.
10. Place the coolant container (with the refill hose inserted) at the same level as the top of the radiator. Then open the ball valve on the refill hose so the coolant will be drawn up to fill the cooling system. The cooling
system is full when the vacuum gauge reads zero.
CAUTION:
Do not allow the coolant container to get too low when filling, to avoid air from being drawn into
the cooling system.
11. Remove the Tool from the radiator neck opening and install the radiator cap.
12. Remove the non-vented reservoir cap.
13. Fill the cooling system reservoir tank to the specified level. Run the engine to warm up the cooling system and top up the system as necessary before installing the vented reservoir cap.
FLUSHING COOLING SYSTEM
1. Drain the water from the engine cooling system. Refer to MA-13, "DRAINING ENGINE COOLANT" .
2. Fill the radiator and the reservoir tank (to the “MAX” line), with water. Reinstall the radiator cap and leave
the vented reservoir cap off. Tool number : KV991J0070 (J-45695)
Cooling system capacity
(with reservoir)
: Refer to
MA-11, "
Fluids
and Lubricants" .
Compressed air
supply pressure : 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm
2 ,
80 - 120 psi)
LLIA0058E
Altitude above sea level Vacuum gauge reading
0 - 100 m (328 ft) : 28 inches of vacuum
300 m (984 ft) : 27 inches of vacuum
500 m (1,641 ft) : 26 inches of vacuum
1,000 m (3,281 ft) : 24 - 25 inches of vacuum
LLIA0057E

MA-16
ENGINE MAINTENANCE
Revision: November 20092006 QX56
3. Run the engine until it reaches normal operating temperature.
4. Press the engine accelerator two or three times under no-load.
5. Stop the engine and wait until it cools down.
6. Drain the water from the engine cooling system. Refer to MA-13, "
DRAINING ENGINE COOLANT" .
7. Repeat steps 2 through 6 until clear water begins to drain from the radiator.
Checking Fuel LinesELS001PI
Inspect the fuel lines and fuel tank for improper mounting, leaks,
cracks, damage, loose connections, chafing, or deterioration.
As necessary, repair or replace any faulty parts.
Changing Fuel FilterELS001PJ
The fuel filter is part of the fuel level sensor unit, fuel filter and fuel pump assembly. Refer to FL-6, "FUEL
LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .
WARNING:
Before replacing the fuel filter, release the fuel pressure from the fuel system. Refer to EC-80, "
FUEL
PRESSURE RELEASE" .
Changing Engine Air Cleaner FilterELS001PK
VISCOUS PAPER TYPE
NOTE:

The viscous paper type filter does not need cleaning between replacement intervals.

Replace the air filter as necessary for required maintenance.
1. Remove the air duct and resonator assembly.
2. Disconnect the harness connector, then remove the air cleaner case (upper).
3. Remove the air cleaner filter from the air cleaner case (lower).
4. Install the new air cleaner filter in the air cleaner case (lower).
SMA803A
1. Air cleaner case (upper) 2. Air cleaner filter3. Air cleaner case (lower)
4. Air duct and resonator assembly
WBIA0465E

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Revision: November 2009 2006 QX56
5. Install the air cleaner case (upper) and connect the harness connector.
6. Install the air duct and resonator assembly (inlet).
Changing Engine OilELS001PL
WARNING:

Be careful not to burn yourself, as the engine and engine oil are hot.

Prolonged and repeated contact with used engine oil may cause skin cancer; try to avoid direct
skin contact with used oil. If skin contact is made, wash thoroughly with soap or hand cleaner as
soon as possible.
1. Warm up the engine, and check for any oil leaks.
2. Stop the engine and wait for at least 10 minutes.
3. Remove the oil drain plug and oil filler cap to drain the old oil.
4. Install a new washer on the oil drain plug, then install the oil drain plug in the oil pan.
CAUTION:
Clean the drain plug and install with a new washer.
5. Refill the engine with new specified engine oil.
CAUTION:
The refill capacity depends on the oil temperature and drain time. Use the “Refill oil capacity” val-
ues as a reference and check the oil level using the dipstick when filling the engine with oil.
6. Warm up the engine and check the area around the drain plug and oil filter for any oil leaks.
7. Stop the engine and wait for more than 10 minutes.
8. Check the oil level using the dipstick as shown. Add oil as nec- essary and install the oil filler cap.
CAUTION:
Do not overfill the engine with oil.
Changing Oil FilterELS001PM
REMOVAL
1. Remove the engine front undercover using power tool.
2. Remove the oil filter using Tool as shown.
CAUTION:

The oil filter is equipped with a pressure relief valve.

Use Genuine NISSAN oil filter or equivalent.

Be careful not to get burned when the engine and engine
oil are hot.

When removing, prepare a shop cloth to absorb any
engine oil leaks or spills.

Do not allow engine oil to adhere to the drive belts.

Completely wipe off any engine oil that adheres to the engine and the vehicle.
INSTALLATION
1. Remove foreign materials adhering to the oil filter seal mating surface. Oil drain plug : Refer to EM-78, "
CYLINDER BLOCK" .
Oil grade and viscosity : Refer to MA-11, "
Fluids and Lubricants" .
Oil capacity : Refer to MA-11, "
Fluids and Lubricants" .
SMA954C
Tool number : KV10115801 (J-38956)
WBIA0388E

MA-18
ENGINE MAINTENANCE
Revision: November 20092006 QX56
2. Apply clean engine oil to the oil filter seal circumference of the
new oil filter.
3. Screw the oil filter manually until it touches the installation sur- face, then tighten it by 2/3 turn. Or tighten to specification.
4. Inspect the engine for oil leaks. Refer to MA-18, "
INSPECTION
AFTER INSTALLATION" .
5. Install the engine front undercover using power tool.
INSPECTION AFTER INSTALLATION
1. Check the oil level using the dipstick as shown. Add oil as nec- essary.
CAUTION:
Do not overfill the engine with oil.
2. Start the engine and check for engine oil leaks.
3. Stop the engine and wait for 10 minutes.
4. Check the engine oil level and add engine oil as required.
Changing Spark PlugsELS001PN
SMA010
Oil filter : 17.7 N·m (1.8 kg-m, 13 ft-lb)
SMA229B
SMA954C
1. Ignition coil 2. Spark plug
WBIA0796E

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Revision: November 2009 2006 QX56
REMOVAL
1. Remove the ignition coil. Refer to EM-28, "IGNITION COIL" .
2. Remove the spark plug(s) using a suitable tool.
INSPECTION AFTER REMOVAL

Do not use a wire brush for cleaning.

If the spark plug tip is covered with carbon, a spark plug cleaner may be used.

Checking and adjusting the spark plug gap is not required
between change intervals.
INSTALLATION
Installation is in the reverse order of removal.

Use standard type spark plug for normal condition.

The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions
such as:
–Frequent engine starts
–Low ambient temperatures

The cold type spark plug is suitable when spark knock occurs with the standard type spark plug under
conditions such as:
–Extended highway driving
–Frequent high engine revolution
SEM294A
SMA773C
Cleaner air pressure : Less than 588 kPa (5.9 bar, 6 kg/cm2 , 85 psi)
Cleaning time : Less than 20 seconds
SMA806CA

MA-20
ENGINE MAINTENANCE
Revision: November 20092006 QX56
CAUTION:
Do not drop or shock spark plug.
Checking EVAP Vapor LinesELS001PO
1. Visually inspect the EVAP vapor lines for improper attachment, cracks, damage, loose connections, chaf-
ing, or deterioration.
2. Inspect the vacuum relief valve of the fuel tank filler cap for clogging and sticking. Refer to EC-37, "
How to Detect Fuel Vapor Leakage" .
Make NGK
Model StandardFFV
Standard type DILFR5A-11DILFR5A-11D
Gap (Nominal) :1.1 mm (0.043 in)

MA-22
CHASSIS AND BODY MAINTENANCE
Revision: November 20092006 QX56
6. Install the lower glove box in the instrument panel and secure it
with the two hinge pins.
Checking Exhaust SystemELS001BZ
Check exhaust pipes, muffler and mounting for improper attachment,
leaks, cracks, damage, loose connections, chafing or deterioration.
Checking Automatic Transmission Fluid (ATF)ELS001PQ
1. Remove the ATF level gauge bolt.
2. Before driving, the ATF level can be checked at ATF tempera-tures of 30 ° to 50 °C (86 ° to 122 °F) using the “COLD” range on
the ATF level gauge as follows:
a. Park the vehicle on a level surface and set the parking brake.
b. Start the engine and move the selector lever through each gear position. Shift the selector lever into the “P” position.
c. Check the ATF level with the engine idling.
d. Remove the ATF level gauge and wipe it clean with a lint-free paper.
CAUTION:
When wiping the ATF from the ATF level gauge, always use
a lint-free paper, not a cloth.
e. Re-insert the ATF level gauge into the charging pipe until the cap contacts the top of the charging pipe as shown.
CAUTION:
To check ATF level, insert the ATF level gauge until the cap
contacts the top of the charging pipe, with the gauge
reversed from the normal inserted position.
f. Remove the ATF level gauge and note the ATF level. If the ATF level is at low side of range, add ATF to the transmission
through the charging pipe.
CAUTION:
Do not overfill the transmission with ATF.
g. Install the ATF level gauge and the ATF level gauge bolt.
3. Warm up the engine.
4. Check for any ATF leaks.
5. Drive the vehicle to increase the ATF temperature to 80 ° C (176 ° F).
WLIA0027E
SMA211A
WLIA0014E
ATF level gauge bolt : Refer to AT- 2 5 0 , "Components" .
SCIA1684E